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| | Brain - Definition, Description, The brain stem, The diencephalon, The cerebrum, The cerebellum |
 | | About 0.08 in (2 mm) thick with a surface area about 5 sq ft (0.5 sq m), it's nearly half the size of an office desk. |
 | | White matter, composed of nerve fibers covered with myelin sheaths, lies beneath the gray matter. |
 | | During embryonic development, the gray matter grows faster than the white and folds in on itself, giving the brain its characteristic wrinkles, called convolutions, or gyri; the grooves between them are known as sulci. |
| www.minddisorders.com /A-Br/Brain.html (1438 words) |
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